head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Systems & Chaos
Solvable micro-tactics puzzles gated by gacha luck over unit ownership.

Optimization · Pure Optimization
Building a team and exploiting type-matchup math against scripted trainers.
Fire Emblem Heroes leans Optimization (Systems & Chaos); Pokémon LeafGreen Version leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Drag-and-drop tactics need no dexterity
Pokémon LeafGreen Version
Menu-driven turn battles demand no physical skill
Fire Emblem Heroes leans a little harder on reads, though the gap is small.
Fire Emblem Heroes
Arena defense teams are AI-run, so prediction is shallow
Pokémon LeafGreen Version
Trainers are scripted; link battles are a side mode
Fire Emblem Heroes leans a little harder on variance, though the gap is small.
Fire Emblem Heroes
Gacha summoning rolls gate which units you even own
Pokémon LeafGreen Version
Wild encounters, catch rolls and crits add mappable RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Heroes
Skill inheritance, team building and tile math are deeply solvable
Pokémon LeafGreen Version
Type matchups and team building are the solvable core
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.